/*
 *      vm.cpp
 *      
 *      Copyright 2009 AzureSky <AzureSky.fedora@gmail.com>
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */


#include "vm.h"

vm_opt::vm_opt()
{
}

vm_opt::~vm_opt()
{
}

/* Tendency to steal mapped memory */
int vm_opt::about_swappiness()
{
	int swap[] = {CTL_VM,VM_SWAPPINESS};
	int curr;
	size_t curr_size = sizeof(curr);
	
	int result = sysctl(swap,2,&curr,&curr_size,0,0);
	
	return (result != -1 ? curr : result);	
}

int vm_opt::change_swappiness(int arg)
{
	int swap[] = {CTL_VM,VM_SWAPPINESS};
	int new_value = arg;
	size_t new_size = sizeof(new_value);
	
	int result = sysctl(swap,2,0,0,&new_value,new_size);
	if(result == -1){
		return -1;
	}
	
	return about_swappiness();
}
